Shadows of Vespera

Corruption is a gateway

Kuldu Kraik

Ancient Kuldu Kraik, the broken dragon, crone wyrm of the high mountains, is a legendary beast that demands blood and sacrifices under a Waxing moon for dark rites, and a waning moon for blessed rites.

Bad good in some cults, good god to witches and the like. Warlocks make pacts with Kuldu Kraik. Druids draw power from dark and light wells, ley lines that represent the spread of the broken wyrms wings.